im on yasmin.
pros: skin is clearer, less painful periods, greater percentage of protection and if you're going on holiday/school trips you can miss your period and it is perfectly safe.
cons: longer periods, slight morning sickness for the first couple of days when yo start taking it.
im not sure if I could say that Yasmin increased my boob size, as i'm still growing (even tho. i'm nearing 18.) pretty much, as long as your reasonably healthy, and not deficient in iron (which causes the pill to not work as effectively) they'd be no major side effects.